public static List <int> GetColumns(Expression expression, ColumnExtractionModes columnExtractionModes)
{
var gatherer = new ColumnGatherer(columnExtractionModes);
gatherer.Visit(expression);
var distinct = gatherer.DistinctValues
? gatherer.columns.Select(p => p.First).Distinct()
: gatherer.columns.Select(p => p.First);
var ordered = gatherer.OrderedValues
? distinct.OrderBy(i => i)
: distinct;
return(ordered.ToList());
}
public List <Pair <int, Expression> > GetColumnsAndExpressions(ColumnExtractionModes columnExtractionModes)
{
return(ColumnGatherer.GetColumnsAndExpressions(Item, columnExtractionModes));
}
public List <int> GetColumns(ColumnExtractionModes columnExtractionModes)
{
return(ColumnGatherer.GetColumns(Item, columnExtractionModes));
}
// Constructors
private ColumnGatherer(ColumnExtractionModes columnExtractionModes)
{
this.columnExtractionModes = columnExtractionModes;
}
public List <int> GetColumns(ColumnExtractionModes columnExtractionModes) => ColumnGatherer.GetColumns(Item, columnExtractionModes);